The firmware status section of the dashboard does seem to have become a bit useless at the moment. For example the current stable MX 17.x firmware released within the last week is marked as a warning with the expiry date set at the end of August. The only way to get the dashboard to be 'green' is to upgrade all MXs to the, somewhat early adopter, MX 18.107.2 firmware with the associated struggles.
I had some problems in version 18.107.2. In one of them I could no longer access my machines via RDP, but what bothered me the most was that even my prints via the network stopped working, so I was forced to rollback.